Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7f4942f2d3e1a27…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 03:15:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29a4fd5415670a88f5c7f7dd6c13449a SHA-1: 545bfee6e047b0ee0f43d75a3f44b18d161ecab2 SHA-256: b7f4942f2d3e1a2729a86a14cfda33e988c4a01d94d6ec792e65a8107a8d137f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with a specific detection name indicating it's a phishing-related PDF. An external URI pointing to 'dafemum.ru' was extracted, which is highly suspicious given the context. The document body, though heavily obfuscated, contains references to 'Vermont castings intrepid manual' and 'wkhtmltopdf', suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/aws?utm_term=vermont+castings+intrepid+manual
    • http://reduslimitalia-oficial.site/libro_el_talmud_en_espaolx2sbj.pdf
    • https://cdn.sqhk.co/jutafegobexe/haUq8Nc/17600853389.pdf
    • http://tpdreport.com/honda_rancher_350_oil_filter_autozonevmd4a.pdf
    • https://cdn.sqhk.co/kaxonavi/f2hbfKA/thrill_rush_theme_park_oyna.pdf
    • https://cdn.sqhk.co/pubodegosog/bid2HX7/26079420563.pdf
    • https://cdn.sqhk.co/wibetaxor/gdEgcQC/talking_santa_claus_toy.pdf
    • http://ketosimple.online/50103544697ucg9i.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/jopomodilamego/samsung_gt-_s5570_aggiornamento_android.pdf
    • http://seluxud.epizy.com/98679101165.pdf
    • https://s3.amazonaws.com/bovenotojitowe/supplier_business_plan_template.pdf
    • https://s3.amazonaws.com/tumuzu/81456219464.pdf
    • http://repeputowuz.epizy.com/manualidades_para_halloween_reciclado.pdf
    • https://uploads.strikinglycdn.com/files/8fe9ff0a-357d-4bd8-9036-43db1ae3f72e/76414527134.pdf
    • http://rosuwofa.rf.gd/metuwir.pdf
    • http://dovobol.epizy.com/how_to_write_an_argumentative_essay_on_animal_testing.pdf
    • https://s3.amazonaws.com/mefovu/belkin_n600_db_wireless_n_router_firmware_update.pdf
    • http://zetuvidofik.epizy.com/henkaku_3._70_guide.pdf
    • http://wigezenefibi.epizy.com/randall_thompson_alleluia.pdf
    • https://uploads.strikinglycdn.com/files/d2496648-7058-4e35-a322-dec302e2a53b/petty_and_cacioppo_persuasion.pdf
    • http://gurelijefumodaw.epizy.com/kesoj.pdf
    • http://xilereguf.rf.gd/nordic_track_exp_1000_parts.pdf
    • https://uploads.strikinglycdn.com/files/6b54b685-d2ba-402b-9306-1949a8f20697/89833680736.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbfb.bin
f499d5642801eea3f722e1006422d5ddc16026d9f7f58da3ea0a85192bc3bbbf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 5240 bytes
font_01_sfnt_off0000eda9.bin
fc83a60ec16472f82b99158f2fd9885371fce7577b0d0a3c297dfa09e271a51e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA9 10844 bytes
font_02_sfnt_off00011256.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11256 4324 bytes

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